----- Original Message -----
From: "Lennart Augustsson" <lennart@mail.augustsson.net>
To: "Jun-ichiro itojun Hagino" <itojun@iijlab.net>
Cc: <tech-kern@netbsd.org>
Sent: Wednesday, September 06, 2000 11:27 AM
Subject: Re: power hook and spl level
> Jun-ichiro itojun Hagino wrote:
>
> > do you guys think this is necessary for netbsd too?
> > or it is drivers that need to be corrected?
>
> Our power hooks run at splhigh() (in current), so it should not
> be needed.
Well, could I call tsleep in power hook?
Some driver might want to
- notify user process of the power event
- wait until the device transfer into some state
- interact with other kernel thread
I propose introducing new power events which are
processed in lower level like below:
dopowerhooks(PWR_SOFTSUSPEND);
apm_spl = splhigh();
dopowerhooks(PWR_SUSPEND);
/* suspned... */
dopowerhooks(PWR_RESUME);
splx(apm_spl);
dopowerhooks(PWR_SOFTRESUME);
I want to notify some user process which maps graphic
frame buffer before suspending.
Takemura